Cube glass



FIG. 1 is a side perspective view of a cube glass showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof; and,

FIG. 4 is a top view thereof.

The broken lines in the drawings depict portions of the cube glass that form no part of the claimed design. 

CLAIM The ornamental design for a cube glass, as shown and described. 